Russian medallist at Games suspected of doping - source

Feb 13, 2018; Gangneung, South Korea; Aleksandr Krushelnitckii (OAR) during the mixed doubles curling bronze medal game during the Pyeongchang 2018 Olympic Winter Games at Gangneung Curling Centre. Mandatory Credit: James Lang-USA TODAY Sports

PYEONGCHANG, South Korea (Reuters) - A Russian medallist at the Pyeongchang Winter Olympics is suspected of having tested positive for a banned substance, a source at the Games said on Sunday, in a potential major blow to Russia's efforts to emerge from a drug-cheating scandal.

Alexander Krushelnitsky, a bronze-medallist along with his wife in mixed-doubles curling, is suspected of having tested positive for meldonium, the source said. Meldonium increases blood flow which improves exercise capacity in athletes.